In the tidy backyard of Kate Cox’s Dallas-area home, there are two child-size lawn chairs alongside two toddler bicycles. There are two red-and-white stuffed horses in the playroom, and two sippy cups sitting in the sink. Everywhere you look, there are two of everything. The only problem is, there should be three.
Last year, Cox and her husband Justin were thrilled to learn that she was pregnant again. They had always planned to have a large family—three, maybe even four kids. When Cox saw the positive pregnancy test in August, she ran into the playroom to tell Justin, who was wrestling on the floor with their 3-year-old daughter and 18-month-old son. Justin immediately started considering whether they would need a bigger car; Kate was just excited.
But a few more weeks into her pregnancy, Cox
